PHP/MySQL Interest Calculator/Comparison Script

Interest calculator (for bank accounts) for my website in PHP/MySQL. Webform with 2 fields: Field 1 = money, Field 2 = time (select) for example 10.000 for 3 month The script should 1. list the best from about 10-15 offers (stored in a mysql db) 2. and calculate the earnings for every offer. Some additional information about the offer/bank should be stored in the mysql db, too. You get this information from me of course. At the end I should be able to edit everything. Example (in german) [login to view URL]